Problem with Tuner B in Vu+ Ultimo

I'm having problems with Tuner B on my Ultimo. I'm using Openvix 3.0, build 554.
My set up is I had 2 satellite tuners in A and B for FTA channels on 28.2E, and a terrestrial tuner for the Irish stations in slot C.
I noticed last week if I had a program recording and I changed to another channel, the picture would freeze and get pixelated. This was always on tuner B. I thought initially the problem was a faulty tuner in slot B and I got a new tuner. I actually got the dual tuner for the Ultimo. I put this in slot C and replaced the tuner in B with the terrestrial tuner
Tuner A: single Sat 28.2E
Tuner B: DVB-T for Irish saorview channels
Tuner C: Single Sat 28.2E
Tuner D: Same as Tuner A.
Now the DVB-T in B doesn't work, same problem , frozen pixelated picture.
I then swaped A and B , DVB-T then works fine in A , but B not working. So basically now all I can do is record one channel and watch another one and I have lost my terrestrial channels. I tried flashing a new image ( Black Hole), and same result. Just wondering have I missed something or is there anything else I could try ?

Yeah I was afraid of that all right. It seems my Ultimo has now become a duo.